探索了由芳基磺酸盐和磷酸盐光化学生成α,n-二氢甲苯二基自由基的范围及其化学性质。通过以三重态从底物上酯阴离子的杂化裂解,对邻和对(三甲基甲硅烷基甲基)苯基三氟甲磺酸酯进行辐照,可以有效地获得热不可及的α,2-和α,4-中间体。形成三重态苯基阳离子,从中损失三甲基甲硅烷基阳离子可提供所需的双自由基(3 Me 3 SiCH 2 C 6 H 4 -OZ→ 3 Me 3 SiCH 2 C 6 H4 + →交通⋅ CH 2 C ^ 6 ħ 4 ⋅)。需要三重态敏化,为此始终使用丙酮。直接照射引线,相反,到光弗里斯片段化(1我3 SICH 2 ç 6 ħ 4 ø-Z→我3 SICH 2 ç 6 ħ 4 ö ⋅ + Z ⋅)。对于甲磺酸酯,酯的裂解较不方便,与三联体的进一步竞争是直接脱甲硅烷基化。虽然效率差,但也可以从相应的磷酸盐获得二氢甲苯。
探索了由芳基磺酸盐和磷酸盐光化学生成α,n-二氢甲苯二基自由基的范围及其化学性质。通过以三重态从底物上酯阴离子的杂化裂解,对邻和对(三甲基甲硅烷基甲基)苯基三氟甲磺酸酯进行辐照,可以有效地获得热不可及的α,2-和α,4-中间体。形成三重态苯基阳离子,从中损失三甲基甲硅烷基阳离子可提供所需的双自由基(3 Me 3 SiCH 2 C 6 H 4 -OZ→ 3 Me 3 SiCH 2 C 6 H4 + →交通⋅ CH 2 C ^ 6 ħ 4 ⋅)。需要三重态敏化,为此始终使用丙酮。直接照射引线,相反,到光弗里斯片段化(1我3 SICH 2 ç 6 ħ 4 ø-Z→我3 SICH 2 ç 6 ħ 4 ö ⋅ + Z ⋅)。对于甲磺酸酯,酯的裂解较不方便,与三联体的进一步竞争是直接脱甲硅烷基化。虽然效率差,但也可以从相应的磷酸盐获得二氢甲苯。
Nickel-Catalyzed Csp<sup>2</sup>–Csp<sup>3</sup>Bond Formation via C–F Bond Activation
作者:Yee Ann Ho、Matthias Leiendecker、Xiangqian Liu、Chengming Wang、Nurtalya Alandini、Magnus Rueping
DOI:10.1021/acs.orglett.8b02351
日期:2018.9.21
A nickel-catalyzed cross coupling of aryl fluorides via C–Fbondactivation has been developed. The alkylation method allows selective replacement of aryl fluorides by alkyl groups and enables the synthesis of diverse and otherwise difficult to access scaffolds in good yields.
structural options in medicinal chemistry is a promising approach to develop new drug candidates. In this research, we designed and synthesized a series of B-hydroxyphenyl phosphine boranederivatives and investigated their structure–property and structure–activity relationships. The synthesized B-phenylphosphine boranederivatives exhibited sufficient stability in aqueous media, weaker hydrophobicity than